Iterator<String> iterator = singletonList("foo").iterator();
    assertEquals("foo", getOnlyElement(iterator, "bar"));
  }

  public void testGetOnlyElement_withDefault_empty() {
    Iterator<String> iterator = emptyIterator();
    assertEquals("bar", getOnlyElement(iterator, "bar"));
  }

  public void testGetOnlyElement_withDefault_empty_null() {
    Iterator<String> iterator = emptyIterator();

    assertThat(headers.values("foo")).containsExactly("bar", "baz", "bak")
    assertThat(headers.values("key")).containsExactly("value")
    assertThat(headers.values("ping")).containsExactly("pong")
    assertThat(headers.values("kit")).containsExactly("kat")
  }

  @Test fun addThrowsOnEmptyName() {
    assertFailsWith<IllegalArgumentException> {
      Headers.Builder().add(": bar")
    }

    multimap.put(new DerivedComparable("bar"), new DerivedComparable("b"));
    multimap.put(new DerivedComparable("bar"), new DerivedComparable("a"));
    multimap.put(new DerivedComparable("bar"), new DerivedComparable("r"));
    assertThat(multimap.keySet())
        .containsExactly(new DerivedComparable("bar"), new DerivedComparable("foo"))
        .inOrder();
    assertThat(multimap.values())

foo.txt foo bar.txt bar...

        with client.websocket_connect("/items/bar/ws?token=some-token") as websocket:
            message = "Message one"
            websocket.send_text(message)
            data = websocket.receive_text()
            assert data == "Session cookie or query token value is: some-token"
            data = websocket.receive_text()
            assert data == f"Message text was: {message}, for item ID: bar"
            message = "Message two"

@app.get("/items/innerinvalid", response_model=Item)
def get_innerinvalid():
    return {"name": "double invalid", "price": "foo", "owner_ids": ["foo", "bar"]}


@app.get("/items/invalidlist", response_model=List[Item])
def get_invalidlist():
    return [
        {"name": "foo"},
        {"name": "bar", "price": "bar"},
        {"name": "baz", "price": "baz"},
    ]


client = TestClient(app)


def test_invalid():

            "item": {
                "name": "Bar",
                "price": 0.2,
                "description": "Some bar",
                "tax": "5.4",
            }
        },
    )
    assert response.status_code == 200
    assert response.json() == {
        "item_id": 6,
        "item": {
            "name": "Bar",
            "price": 0.2,
            "description": "Some bar",
            "tax": 5.4,
        },

            "item": {
                "name": "Bar",
                "price": 0.2,
                "description": "Some bar",
                "tax": "5.4",
            }
        },
    )
    assert response.status_code == 200
    assert response.json() == {
        "item_id": 6,
        "item": {
            "name": "Bar",
            "price": 0.2,
            "description": "Some bar",
            "tax": 5.4,
        },

    response = client.put("/get-or-create-task/foo")
    print(response.content)
    assert response.status_code == 200, response.text
    assert response.json() == "Listen to the Bar Fighters"
    response = client.put("/get-or-create-task/bar")
    assert response.status_code == 201, response.text

            if (arg.startsWith("\"")) {
                // if we're in the process of building up another arg, push it and start over.
                // this is for the case: "-Dfoo=bar "-Dfoo2=bar two" (note the first unterminated quote)
                if (currentArg != null) {
                    cleaned.add(currentArg.toString());
                }

                // start building an argument here.